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[media] v4l: subdev: Add pad config allocator and init

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Add a new subdev operation to initialize a subdev pad config array, and
a helper function to allocate and initialize the array. This can be used
by bridge drivers to implement try format based on subdev pad
operations.

Signed-off-by: Laurent Pinchart <laurent.pinchart@linaro.org>
Acked-by: Vaibhav Hiremath <vaibhav.hiremath@linaro.org>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Laurent Pinchart 2015-04-24 20:06:31 -03:00 committed by Mauro Carvalho Chehab
parent 45b46879a7
commit 9b02cbb3ed
2 changed files with 43 additions and 4 deletions
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35
drivers/media/v4l2-core/v4l2-subdev.c
View file

@ -35,9 +35,11 @@
static int subdev_fh_init(struct v4l2_subdev_fh *fh, struct v4l2_subdev *sd)
{
#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
fh->pad = kzalloc(sizeof(*fh->pad) * sd->entity.num_pads, GFP_KERNEL);
if (sd->entity.num_pads) {
fh->pad = v4l2_subdev_alloc_pad_config(sd);
if (fh->pad == NULL)
return -ENOMEM;
}
#endif
return 0;
}
@ -45,7 +47,7 @@ static int subdev_fh_init(struct v4l2_subdev_fh *fh, struct v4l2_subdev *sd)
static void subdev_fh_free(struct v4l2_subdev_fh *fh)
{
#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
kfree(fh->pad);
v4l2_subdev_free_pad_config(fh->pad);
fh->pad = NULL;
#endif
}
@ -569,6 +571,35 @@ int v4l2_subdev_link_validate(struct media_link *link)
sink, link, &source_fmt, &sink_fmt);
}
EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate);
struct v4l2_subdev_pad_config *
v4l2_subdev_alloc_pad_config(struct v4l2_subdev *sd)
{
struct v4l2_subdev_pad_config *cfg;
int ret;
if (!sd->entity.num_pads)
return NULL;
cfg = kcalloc(sd->entity.num_pads, sizeof(*cfg), GFP_KERNEL);
if (!cfg)
return NULL;
ret = v4l2_subdev_call(sd, pad, init_cfg, cfg);
if (ret < 0 && ret != -ENOIOCTLCMD) {
kfree(cfg);
return NULL;
}
return cfg;
}
EXPORT_SYMBOL_GPL(v4l2_subdev_alloc_pad_config);
void v4l2_subdev_free_pad_config(struct v4l2_subdev_pad_config *cfg)
{
kfree(cfg);
}
EXPORT_SYMBOL_GPL(v4l2_subdev_free_pad_config);
#endif /* CONFIG_MEDIA_CONTROLLER */
void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops)

8
include/media/v4l2-subdev.h
View file

@ -572,6 +572,7 @@ struct v4l2_subdev_pad_config {
/**
* struct v4l2_subdev_pad_ops - v4l2-subdev pad level operations
*
* @init_cfg: initialize the pad config to default values
* @enum_mbus_code: callback for VIDIOC_SUBDEV_ENUM_MBUS_CODE ioctl handler
* code.
* @enum_frame_size: callback for VIDIOC_SUBDEV_ENUM_FRAME_SIZE ioctl handler
@ -607,6 +608,8 @@ struct v4l2_subdev_pad_config {
* may be adjusted by the subdev driver to device capabilities.
*/
struct v4l2_subdev_pad_ops {
int (*init_cfg)(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg);
int (*enum_mbus_code)(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_mbus_code_enum *code);
@ -801,7 +804,12 @@ int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd,
struct v4l2_subdev_format *source_fmt,
struct v4l2_subdev_format *sink_fmt);
int v4l2_subdev_link_validate(struct media_link *link);
struct v4l2_subdev_pad_config *
v4l2_subdev_alloc_pad_config(struct v4l2_subdev *sd);
void v4l2_subdev_free_pad_config(struct v4l2_subdev_pad_config *cfg);
#endif /* CONFIG_MEDIA_CONTROLLER */
void v4l2_subdev_init(struct v4l2_subdev *sd,
const struct v4l2_subdev_ops *ops);